Physics: Waves Flashcards Preview

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Flashcards in Physics: Waves Deck (39)
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1
Q

what do waves do

A

waves transfer energy

2
Q

what is amplitude

A

displacement from undisturbed position to crest

3
Q

what is wavelength

A

distance between the same point on two adjacent waves

4
Q

what is the trough

A

the turning point of the wave back up

5
Q

what is the crest

A

the peak of the wave where it comes back down

6
Q

describe a transverse wave

A

the oscillations are perpendicular to the direction of energy transfer

7
Q

describe a longitudinal wave

A

the oscillations are parallel to the direction of energy transfer

8
Q

what is the wave speed equation

A

v (wave speed) = f(frequency) x λ (wavelength)

9
Q

what three hings can all waves be

A

absorbed, transmitted, reflected

10
Q

what is the normal

A

imaginary line that is perpendicular to the surface of the object at the point of incidence

11
Q

what is the angle of incidence

A

angle between the incoming wave and the normal

12
Q

what is angle of reflection

A

angle between the reflected wave and the normal

13
Q

what is the angle rule

A

angle of incidence = angle of reflection

14
Q

what 4 things do all EM waves have incommon

A

All EM waves are transverse, emitted from one source then absorbed or reflected by another, travel at the speed of light, can travel through air or a vacuum

15
Q

what are the seven EM waves in ascending frequency

A

Radio Waves, Microwaves, Infrared, Visible light, Ultra Violet, X-Rays, Gamma Rays

16
Q

what are radio waves used for

A

Communication

17
Q

what are microwaves used for

A

satellite communication and cooking

18
Q

what are infrared waves used for

A

increase or monitor temperature

19
Q

what is visible light used for

A

transmit data in fibre optic cables

20
Q

what can UV waves do

A

give you a tan

21
Q

what are X-Rays and Gamma rays used for

A

radiography and medical tracers

22
Q

what is the risk of EM waves

A

The EM radiation can be harmful to people

23
Q

what are the two types of lenses

A

convex and concave

24
Q

what do convex lens do to rays

A

bend the light towards the normal

25
Q

what do concave lens do to rays

A

bend light away from the normal

26
Q

what two images can lenses produce

A

virtual and real

27
Q

what four other words can be used to describe an image

A

upright, inverted, magnified, diminished

28
Q

what is the magnification equation

A

magnification = image height / object height

29
Q

what do colour and transparency f visible light depend on

A

Absorbed wavelengths

30
Q

what does every object do (infrared radiation)

A

emit and absorb it

31
Q

what surface is the best emitter of infrared

A

matte black

32
Q

what surface is the best absorber of infrared

A

matte black

33
Q

what surface is the best reflecter of infrared

A

shiny white

34
Q

what type of wave is sound wave

A

longitudinal wave

35
Q

what causes sound waves

A

vibrating objects

36
Q

how does the ear work

A

the ear drum vibrates and passes these vibrations onto tiny bones called ossicles to the cochlea. The cochlea converts these vibrations into electrical signals and passes them onto the brain

37
Q

what frequency are sound waves

A

20Hz - 20000Hz

38
Q

what is ultrasound

A

sound wave with a frequency above 20000Hz

39
Q

what is ultrasound used for

A

viewing fetus in a pregnant women and destroying kidney stones